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JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is [CPMT 1971, 88; MP PET 1985]

    A)            100 Gauss                             

    B)            400 Gauss

    C)            50 Gauss                                

    D)            200 Gauss

    Correct Answer: A

    Solution :

               Along the axis of magnet \[{{B}_{a}}=\frac{2M}{{{X}^{3}}}=200\,guass\] \[\Rightarrow {{B}_{a}}=\frac{M}{{{X}^{3}}}=100\,guass\]


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